If in the expansion of $\ (1+x)^p(1-x)^q$ coefficient of $x \& x^2$ is $1 \&-2$ then find $p^2+q^2$

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If in the expansion of \(\ (1+x)^p(1-x)^q\) coefficient of \(x \& x^2\) is \(1 \&-2\) then find \(p^2+q^2\)